While I try to expand some file system or delete snapsure cehckpoints I get error "unable to acquire lock(s), try later". I then have to go to /nas/lock/db and check od -d * to check what process is locked and then kill the process. But this keep on coming again and again.

What possiblities are there that we get these so frequently and also is there a solutions for this

We have NAS700 running with 5.6.52